pallium - noun

the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum

(zoology) a protective layer of epidermis in mollusks or brachiopods that secretes a substance forming the shell

(Roman Catholic Church) vestment consisting of a band encircling the shoulders with two lappets hanging in front and back

cloak or mantle worn by men in ancient Rome

pallium - thesaurus

cortex   mantle